Technical data Flowphant T DTT31, DTT35
38 Endress+Hauser
11 Technical data
11.1 Input
11.1.1 Measured variable
• Flow velocity of liquid media (calorimetric measuring principle)
• Temperature (RTD), optionally for two switch outputs or additional analog output
11.1.2 Measuring range
Flow 0.03 to 3 m/s (0.1 to 9.84 ft/s), as relative value between 0 to 100%; maximum
display resolution: 1%
Temperature –20 to +85 °C (–4 to +185 °F); display resolution: 1 °C (1 °F)
11.2 Output
11.2.1 Signal on alarm
Analog output: signal on alarm according to NAMUR NE43
Underranging Linear drop to 3.8 mA
Overranging Linear rise to 20.5 mA
Sensor breakage; sensor
short-circuit
≤3.6 mA or ≥ 21.0 mA (output 21.7 mA is guaranteed for setting ≥ 21.0 mA)
Switch outputs In the safe state (switch open)
11.2.2 Switching capacity
DC voltage version:
Switch status ON Ia ≤ 250 mA
Switch status OFF Ia ≤ 1 mA
Switching cycles > 10,000,000
Voltage drop PNP ≤2 V
Overload protection Switching current checked automatically; switched off in event of overcurrent,
switching current checked again every 0.5 s; max. capacitive load: 14 µF for max.
supply voltage (without resistive load); periodic disconnection from a protective
circuit in event of overcurrent (f = 2 Hz) and "Warning" displayed
11.3 Power supply
11.3.1 Supply voltage
DC voltage version: 18 to 30 V
DC
(reverse polarity protection)
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